Sony Megatron Colour Video Monitor

[nfp0]

@Cyber

One thing to remember is that those Peak HDR Brightness measurements for the TV all use the white subpixel. RGB based presets in Sony Megatron don’t use the white subpixel at all so your actual effective Peak Luminance might actually be a little lower.

Yes! This sounds like a very plausible explanation. Indeed the white pixel is by far the most powerful on these types of WOLED displays. Seeing as Megatron only used the RGB ones, naturally I would need to set the peak luminance value quite lower than the TV’s maximum.

Indeed at lower brightness levels the colors look totally fine in the shader, and it’s only when I try to compensate for the low brightness (by raising the paper-white luminance) that the colors start looking wrong. So I might be hitting my TV’s RGB pixels peak brightness without reaching a satisfactory brightness level for the shader for normal usage.

In this case I might need to use a shader with mask compensation features, like Guest’s and use HDR to boost overall brightness.

@Cyber

For WOLED displays, use the RWBG/WOLED Display’s Subpixel Layout, Set Colour Accurate/Mask Accurate to Mask Accurate and you can try Vivid Mode in the Shader.

Don’t be surprised if you have to set your Paper White Luminance values almost or just as high as your Peak Luminance to get acceptable brightness and don’t be surprised if you have to increase your Saturation a bit before your colours start to look accurate, in particular Red.

Yes, I am using the RWBG subpixel layout.
I will try the other things you suggested and see how close I can get to an acceptable picture. Thank you!

@Cyber

Feel free to try Sony Megatron preset packs. You might actually have an easier time getting them to look right on your OLED Display as most of them were made using an LG OLED Display.

Ah yes! Good idea! I will try your Megatron presets and see what I can get out of those
I will report back.

[Cyber]

When I used to sit far from my OLED TV I used to use 630/630 for Peak/Paper White Luminance.

When I sat closer, I started using 630/450.

I’ve recently observed that decreasing Viewport Size to 6X provides a nice increase in brightness over 8X and higher.

All else being equal, Shadow Mask and Aperture Grille presets tend to be brighter than Slot Mask Presets.

You should be able to get good enough brightness from an LG C1.

For a hybrid approach though, you can check out my CyberLab Mega Bezel HDR Ready presets.

[man33li]

When trying to compile the .slang shader manually and trying to use crt-sony-megatron.slang alone without the other shaders it gives a failed to apply.

[Azurfel]

crt-sony-megatron.slang calls back to crt-sony-megatron-source-pass.slang (as alias SourceSDR) and crt-sony-megatron-hdr-pass.slang (as alias SourceHDR).

You can replace those with instances of stock.slang, but keep the appropriate aliases, and it will load. You would need convert the image into HDR by some other means tho, otherwise the result is extremely washed out.

What exactly are you trying to do here?

[man33li]

I have been tinkering with shader glass in tainted grail fall of Avalon and found the Megatron preset is great in offering an atmosphere that suits this game reminding me of my old crt Panasonic gaming memories. There are areas in the game extremely red that I can’t barely see anything while using the aforementioned settings.

[Cyber]

@man33li

I have been tinkering with shader glass in tainted grail fall of Avalon

Did you know that there’s a Reshade version of Sony Megatron Colour Video Monitor?

There’s also this:

Official release thread for WindowCast core

WindowCast for Libretro (formerly WGC Window Capture) Libretro core to capture the contents of another window for video processing. This is useful, for say, capturing the output of a standalone emulator (like xemu, Dolphin standalone, RPCS3 or PCSX2 nightlies) or a PC game running in a window and then processing it with RetroArch’s shader stack. Here’s an example of the core in action, capturing Dead Cells (image courtesy of HyperspaceMadness). [MegaBezel-deadcells1] Download I plan to event…

@man33li

There are areas in the game extremely red that I can’t barely see anything

Post some photos of the screen so we can see.

@man33li

while using the aforementioned settings.

What settings?

[Cyber]

@MajorPainTheCactus

you can change this by changing the gamma cutoff point in the shader arguments this should give you 90% of what youre seeing in the photo admittedly without the non zero ‘horizontal pixels’ of the slot mask but aperture grille will look perfect.

I think I’m ready to have a play around with this. Does anyone want to try before I get a chance?

Where can this gamma cut-off point shader argument be found?

Also what can be done to ensure that the horizontal slots of the slot mask don’t get in the way as they’re not supposed to be affected or visible in this scenario?

[Azurfel]

That would be the “Inverse Gamma Cutoff (x1000)” setting, at the tail end of the CRT Settings section in the Shader Parameters.

Keep in mind that it’s not going to have nearly as profound an effect as you want it to tho. As MajorPainTheCactus mentioned, a properly set up CRT’s illuminated shadow mask and imperfect blacks aren’t so noticeable in actual use. What you are seeing is a camera artifact, similar to the rolling/hum bars that appear when a CRT is filmed at an unmatched frame rate/shutter speed.

[Cyber]

@Azurfel

That would be the “Inverse Gamma Cutoff (x1000)” setting, at the tail end of the CRT Settings section in the Shader Parameters.

Thank you very much Azurfel.

@Azurfel

Keep in mind that it’s not going to have nearly as profound an effect as you want it to tho. As MajorPainTheCactus mentioned, a properly set up CRT’s illuminated shadow mask and imperfect blacks aren’t so noticeable in actual use.

I’m not looking to create a profound effect actually.

@Azurfel

As MajorPainTheCactus mentioned, a properly set up CRT’s illuminated shadow mask and imperfect blacks aren’t so noticeable in actual use.

When I use the Base Black Mask feature in CRT-Guest-Advanced, it’s extremwly subtle as is the noise effect in my Mega Bezel and the vast majority of my Mega Bezel Presets. So this is exactly what I would hope to reproduce.

@Azurfel

What you are seeing is a camera artifact, similar to the rolling/hum bars that appear when a CRT is filmed at an unmatched frame rate/shutter speed.

Yeah, I understand what you’re saying but it is there in the case of the former but you’d never pick it up in a Sony Megatron photo unless we set iy up and emulate it. You will see it on CRT photos though.

Update: I’ve tried the full range available in the Shader Parameters for the “Inverse Gamma Cutoff (x1000)” and I can see no change in anything.

[Azurfel]

AzMods20251014

Fully updated for crt-guest-advanced-2025-10-12-release1 (rev 3/final), with a decoupled version of the new PAL shader (crt-guest-advanced-pal-decoupled), and new PAL presets made to take advantage of guest.r’s most recent work.

[Azurfel]

AzMods20251018

Readme with additional details

Built on top of:

• Image Adjustment (2024.02.07) by hunterk

• crt-guest-advanced-2025-10-18-release1 (rev5) by guest.r and Dr. Venom, based in part on Themaister’s NTSC shader

• Sony Megatron Colour Video Monitor (2023.10.09) by MajorPainTheCactus

• with additional functions based on or inspired by Grade by Dogway

All included “CRT Megatron” presets are currently tuned for the LG C1 and other similar displays (WRGB subpixel layout, with approximately 800 nits Peak Luminance).

The included version of Image Adjustment has been modified to allow for finer control of the effects as i found appropriate.

crt-guest-advanced-ntsc has been modified to add or expand the following options

GPGX MS color fix

Corrects Genesis Plus GX’s Master System color output, which includes minor errors i discovered while implementing the Sega MS Nonlinear Blue Fix.

• 0=off
• 1=on (color saturation scaled to a maximum value of RGB 255)
• 2=sat239 (scaled to a maximum value of RGB 239)
• 3=sat210 (scaled to a maximum value of RGB 210)
• 4=sat165 (scaled to a maximum value of RGB 165)

Sega MS Nonlinear Blue Fix

An implementation of the behavior described in Notes & Measures: Nonlinear Blue on Sega Master System 1 & Other Findings by bfbiii.

This setting automatically adjusts to work with the GPGX MS color fix settings.

Sega MD RGB Palette

An implementation/approximation of the Mega Drive/Genesis RGB palette as discussed here.

Downsample Pseudo Hi-Res

As i understand it, 15KHz CRT displays would treat double-horizontal resolution modes (512x224, 640x240, etc) as tho they were not doubled, resulting in a blending effect, called pseudo hi-res. A number of SFC/SNES games are known to have used this behavior for transparency effects, including Breath of Fire II, Jurassic Park, and Kirby’s Dream Land 3, and as far as i know it is the correct behavior for any device originally meant to be displayed on a 15KHz CRT TV/monitor.

• 1 = off

• 2 = Triggers the blending effect whenever the horizontal resolution is more than twice the vertical resolution. This works well with cores that either always output a pseudo hi-res image for compatibility (such as bsnes-jg), or cores that only use pseudo hi-res for pseudo hi-res content (such as SwanStation). True high-resolution/interlaced content is not effected.

• 3 = Triggers the blending effect whenever the horizontal resolution is 480 or higher. This is needed for cores that display pseudo hi-res content in a true high-resolution container (such as Mesen-S and a number of bsnes variants). Unfortunately, this halves the resolution of true high-resolution/interlaced content, as there is no way to differentiate pseudo hi-res and true high-resolution/interlaced content in these cores.

Internal Resolution

Modified to allow up to 1/16th downsampling. (It’s a surprise tool that will help us later.)

Sony Megatron has been modified to add or expand the following options

HDR: Content Color Gamut

Out of the box, RetroArch and Megatron clamp colors to the Rec. 709 gamut (Expand Gamut set to Off in RetroAtch, or HDR: Original/Vivid set to Original in Megatron), or stretch that Rec. 709 gamut to an unusual non-standard gamut created by someone at Microsoft (?Chuck Walbourn?) called Expanded 709 (Expand Gamut set to On in RetroArch, or HDR: Original/Vivid set to Vivid in Megatron).

Obviously, this is undesirable, as all of the major “retro” color gamuts include colors that fall outside of Rec. 709.

Serendipitously, i found that it was possible to turn this problem into it’s own solution by simply adding additional color gamuts to the “HDR: Original/Vivid”, renaming it “HDR: Content Color Gamut” to better reflect it’s newfound purpose.

When using this setting, Colour System should be set to 0/r709, and Phosphors should be set to 0/NONE.

Options are as follows:

• 0=Rec 709/sRGB (SDR HDTV/Windows gamut)
• 1=Expanded 709
• 2=NTSC 1953 (The OG color system that was only really used for like 5-8ish years back when basically no one owned a color TV anyway. If you are Brazillian or from a SECAM region, it may also match some old CRT TVs you’ve used with really weirdly intense greens? Hard to say. This sort of thing is kind of underdocumented.)
• 3=RCA 1958 (?1961?) (Millennial’s grandparent’s old TV with weird colors #1.)
• 4=RCA 1964 (Millennial’s grandparent’s old TV with weird colors #2.)
• 5=SMPTE C/Rec 601-525 line/Conrac (Baseline standard gamut for Analog NTSC.)
• 6=PAL/Rec 601-625 line (Baseline standard gamut for Analog PAL.)
• 7=Dogway’s NTSC-J (Baseline standard gamut for Analog NTSC-J.)
• 8=P22_80s (Dogway’s Grade gamut for 1980s-early 1990s TVs.)
• 9=Apple RGB/Trinitron PC (Should approximate basically any Trinitron monitor from 1987-the mid to late 1990s. By the early 00s, they were SMPTE C instead, at least for high end monitors like the FW900.)
• 10=guest’s Philips PC (Gamut used by a number of extremely popular monitors that used Philips tubes, including Philips CM8533, Philips VS-0080, and Commodore 1084)
• 11=P22_90s (Dogway’s Grade gamut for mid 1990s TVs with tinted phosphors.)
• 12=RPTV_95s (Dogway’s Grade gamut for late 90s/early 00s rear projection TVs that game manuals said you shouldn’t play games on due to burn in risk.)
• 13=Display P3/P3-D65 (Common wide color gamut. Variant on the gamut used for film with shared primaries. Might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader?)
• 14=Rec 2020 (HDR gamut. Again, might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader.)

Gamut Overshoot Fix

A fix MajorPainTheCactus came up with to deal with the color errors i noticed using lilium’s HDR analysis shader. (Sony Megatron Colour Video Monitor)

He decided not to implement it at the time, as he didn’t think it wouldn’t make a perceptible difference, but a friend and i both came to the conclusion that it makes certain test pattern colors look more like they do with no shaders applied, so i have continued to use it. There should be no downside. (Sony Megatron Colour Video Monitor)

• 0=no fix
• 1=the 7-decimal clamp
• 2=the 6-decimal clamp (results in non-zero blacks, perceptible in a sufficiently dark room)

Scanline Multiplier/Divisor

Multiplies or divides the number of scanlines.

Useful for cases like DOS games meant for 31KHz displays, which output 320x200 that was then double scanned to 640x400.

The divisor options are handy for displaying increased internal resolution output from 3D cores that don’t include a good downsample option, such as PPSSPP. I strongly recommend using this setting in conjuction with crt-guest-advanced-ntsc’s Internal Resolution setting to reduce shimmering.

• -1,0,1=1x (Default/off)
• 2=2x (Doublescan)
• 3=Auto 2x (Automatically doublescans any content with a vertical resolution of less than 300, while leaving higher resolution content unchanged)
• -2=1/2 (Reduces the scanline count to one half default)
• -3=1/3 (Reduces the scanline count to one third default)
• -4=1/4 (Reduces the scanline count to one quarter default)
• -5=1/5 (etc.)
• -6=1/6
• -7=1/7
• -8=1/8
• -9=1/9
• -10=1/10
• -11=1/11
• -12=1/12
• -13=1/13
• -14=1/14
• -15=1/15
• -16=1/16

[Azurfel]

AzMods20251022

Readme with additional details

Built on top of:

• Image Adjustment (2024.02.07) by hunterk

• crt-guest-advanced-2025-10-22-release1 (rev2) by guest.r and Dr. Venom, based in part on Themaister’s NTSC shader

• Sony Megatron Colour Video Monitor (2023.10.09) by MajorPainTheCactus

• with additional functions based on or inspired by Grade by Dogway

All included “CRT Megatron” presets are currently tuned for the LG C1 and other similar displays (WRGB subpixel layout, with approximately 800 nits Peak Luminance).

The included version of Image Adjustment has been modified to allow for finer control of the effects as i found appropriate.

crt-guest-advanced-ntsc has been modified to add or expand the following options

GPGX MS color fix

Corrects Genesis Plus GX’s Master System color output, which includes minor errors i discovered while implementing the Sega MS Nonlinear Blue Fix.

• 0=off
• 1=on (color saturation scaled to a maximum value of RGB 255)
• 2=sat239 (scaled to a maximum value of RGB 239)
• 3=sat210 (scaled to a maximum value of RGB 210)
• 4=sat165 (scaled to a maximum value of RGB 165)

Sega MS Nonlinear Blue Fix

An implementation of the behavior described in Notes & Measures: Nonlinear Blue on Sega Master System 1 & Other Findings by bfbiii.

This setting automatically adjusts to work with the GPGX MS color fix settings.

Sega MD RGB Palette

An implementation/approximation of the Mega Drive/Genesis RGB palette as discussed here.

Downsample Pseudo Hi-Res

As i understand it, 15KHz CRT displays would treat double-horizontal resolution modes (512x224, 640x240, etc) as tho they were not doubled, resulting in a blending effect, called pseudo hi-res. A number of SFC/SNES games are known to have used this behavior for transparency effects, including Breath of Fire II, Jurassic Park, and Kirby’s Dream Land 3, and as far as i know it is the correct behavior for any device originally meant to be displayed on a 15KHz CRT TV/monitor.

• 1 = off

• 2 = Triggers the blending effect whenever the horizontal resolution is more than twice the vertical resolution. This works well with cores that either always output a pseudo hi-res image for compatibility (such as bsnes-jg), or cores that only use pseudo hi-res for pseudo hi-res content (such as SwanStation). True high-resolution/interlaced content is not effected.

• 3 = Triggers the blending effect whenever the horizontal resolution is 480 or higher. This is needed for cores that display pseudo hi-res content in a true high-resolution container (such as Mesen-S and a number of bsnes variants). Unfortunately, this halves the resolution of true high-resolution/interlaced content, as there is no way to differentiate pseudo hi-res and true high-resolution/interlaced content in these cores.

Internal Resolution

Modified to allow up to 1/16th downsampling. (It’s a surprise tool that will help us later.)

Sony Megatron has been modified to add or expand the following options

HDR: Content Color Gamut

Out of the box, RetroArch and Megatron clamp colors to the Rec. 709 gamut (Expand Gamut set to Off in RetroAtch, or HDR: Original/Vivid set to Original in Megatron), or stretch that Rec. 709 gamut to an unusual non-standard gamut created by someone at Microsoft (?Chuck Walbourn?) called Expanded 709 (Expand Gamut set to On in RetroArch, or HDR: Original/Vivid set to Vivid in Megatron).

Obviously, this is undesirable, as all of the major “retro” color gamuts include colors that fall outside of Rec. 709.

Serendipitously, i found that it was possible to turn this problem into it’s own solution by simply adding additional color gamuts to the “HDR: Original/Vivid”, renaming it “HDR: Content Color Gamut” to better reflect it’s newfound purpose.

When using this setting, Colour System should be set to 0/r709, and Phosphors should be set to 0/NONE.

Options are as follows:

• 0=Rec 709/sRGB (SDR HDTV/Windows gamut)
• 1=Expanded 709
• 2=NTSC 1953 (The OG color system that was only really used for like 5-8ish years back when basically no one owned a color TV anyway. If you are Brazillian or from a SECAM region, it may also match some old CRT TVs you’ve used with really weirdly intense greens? Hard to say. This sort of thing is kind of underdocumented.)
• 3=RCA 1958 (?1961?) (Millennial’s grandparent’s old TV with weird colors #1.)
• 4=RCA 1964 (Millennial’s grandparent’s old TV with weird colors #2.)
• 5=SMPTE C/Rec 601-525 line/Conrac (Baseline standard gamut for Analog NTSC.)
• 6=PAL/Rec 601-625 line (Baseline standard gamut for Analog PAL.)
• 7=Dogway’s NTSC-J (Baseline standard gamut for Analog NTSC-J.)
• 8=P22_80s (Dogway’s Grade gamut for 1980s-early 1990s TVs.)
• 9=Apple RGB/Trinitron PC (Should approximate basically any Trinitron monitor from 1987-the mid to late 1990s. By the early 00s, they were SMPTE C instead, at least for high end monitors like the FW900.)
• 10=guest’s Philips PC (Gamut used by a number of extremely popular monitors that used Philips tubes, including Philips CM8533, Philips VS-0080, and Commodore 1084)
• 11=P22_90s (Dogway’s Grade gamut for mid 1990s TVs with tinted phosphors.)
• 12=RPTV_95s (Dogway’s Grade gamut for late 90s/early 00s rear projection TVs that game manuals said you shouldn’t play games on due to burn in risk.)
• 13=Display P3/P3-D65 (Common wide color gamut. Variant on the gamut used for film with shared primaries. Might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader?)
• 14=Rec 2020 (HDR gamut. Again, might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader.)

Gamut Overshoot Fix

A fix MajorPainTheCactus came up with to deal with the color errors i noticed using lilium’s HDR analysis shader. (Sony Megatron Colour Video Monitor)

He decided not to implement it at the time, as he didn’t think it wouldn’t make a perceptible difference, but a friend and i both came to the conclusion that it makes certain test pattern colors look more like they do with no shaders applied, so i have continued to use it. There should be no downside. (Sony Megatron Colour Video Monitor)

• 0=no fix
• 1=the 7-decimal clamp
• 2=the 6-decimal clamp (results in non-zero blacks, perceptible in a sufficiently dark room)

Scanline Multiplier/Divisor

Multiplies or divides the number of scanlines.

Useful for cases like DOS games meant for 31KHz displays, which output 320x200 that was then double scanned to 640x400.

The divisor options are handy for displaying increased internal resolution output from 3D cores that don’t include a good downsample option, such as PPSSPP. I strongly recommend using this setting in conjuction with crt-guest-advanced-ntsc’s Internal Resolution setting to reduce shimmering.

• -1,0,1=1x (Default/off)
• 2=2x (Doublescan)
• 3=Auto 2x (Automatically doublescans any content with a vertical resolution of less than 300, while leaving higher resolution content unchanged)
• -2=1/2 (Reduces the scanline count to one half default)
• -3=1/3 (Reduces the scanline count to one third default)
• -4=1/4 (Reduces the scanline count to one quarter default)
• -5=1/5 (etc.)
• -6=1/6
• -7=1/7
• -8=1/8
• -9=1/9
• -10=1/10
• -11=1/11
• -12=1/12
• -13=1/13
• -14=1/14
• -15=1/15
• -16=1/16

[ovitus]

In Reshade 6.6.1:

13:01:32:698 [16368] | ERROR | Failed to compile ‘C:\Users\awright\Documents\Fightcade\emulator\fbneo\reshade-shaders\Shaders\SonyMegatron.fx’: C:\Users\awright\Documents\Fightcade\emulator\fbneo\Shader@0x000002644F24DC00(277,16-53): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them C:\Users\awright\Documents\Fightcade\emulator\fbneo\Shader@0x000002644F24DC00(282,20-29): error X3504: array index out of bounds

[Azurfel]

AzMods20251027

Readme with additional details

Built on top of:

• Image Adjustment (2024.02.07) by hunterk

• crt-guest-advanced-2025-10-27-release1 by guest.r and Dr. Venom, based in part on Themaister’s NTSC shader

• Sony Megatron Colour Video Monitor (2023.10.09) by MajorPainTheCactus

• with additional functions based on or inspired by Grade by Dogway

All included “CRT Megatron” presets are currently tuned for the LG C1 and other similar displays (WRGB subpixel layout, with approximately 800 nits Peak Luminance).

The included version of Image Adjustment has been modified to allow for finer control of the effects as i found appropriate.

crt-guest-advanced-ntsc has been modified to add or expand the following options

GPGX MS color fix

Corrects Genesis Plus GX’s Master System color output, which includes minor errors i discovered while implementing the Sega MS Nonlinear Blue Fix.

• 0=off
• 1=on (color saturation scaled to a maximum value of RGB 255)
• 2=sat239 (scaled to a maximum value of RGB 239)
• 3=sat210 (scaled to a maximum value of RGB 210)
• 4=sat165 (scaled to a maximum value of RGB 165)

Sega MS Nonlinear Blue Fix

An implementation of the behavior described in Notes & Measures: Nonlinear Blue on Sega Master System 1 & Other Findings by bfbiii.

This setting automatically adjusts to work with the GPGX MS color fix settings.

Sega MD RGB Palette

An implementation/approximation of the Mega Drive/Genesis RGB palette as discussed here.

Downsample Pseudo Hi-Res

As i understand it, 15KHz CRT displays would treat double-horizontal resolution modes (512x224, 640x240, etc) as tho they were not doubled, resulting in a blending effect, called pseudo hi-res. A number of SFC/SNES games are known to have used this behavior for transparency effects, including Breath of Fire II, Jurassic Park, and Kirby’s Dream Land 3, and as far as i know it is the correct behavior for any device originally meant to be displayed on a 15KHz CRT TV/monitor.

• 1 = off

• 2 = Triggers the blending effect whenever the horizontal resolution is more than twice the vertical resolution. This works well with cores that either always output a pseudo hi-res image for compatibility (such as bsnes-jg), or cores that only use pseudo hi-res for pseudo hi-res content (such as SwanStation). True high-resolution/interlaced content is not effected.

• 3 = Triggers the blending effect whenever the horizontal resolution is 480 or higher. This is needed for cores that display pseudo hi-res content in a true high-resolution container (such as Mesen-S and a number of bsnes variants). Unfortunately, this halves the resolution of true high-resolution/interlaced content, as there is no way to differentiate pseudo hi-res and true high-resolution/interlaced content in these cores.

Internal Resolution

Modified to allow up to 1/16th downsampling. (It’s a surprise tool that will help us later.)

Sony Megatron has been modified to add or expand the following options

HDR: Content Color Gamut

Out of the box, RetroArch and Megatron clamp colors to the Rec. 709 gamut (Expand Gamut set to Off in RetroAtch, or HDR: Original/Vivid set to Original in Megatron), or stretch that Rec. 709 gamut to an unusual non-standard gamut created by someone at Microsoft (?Chuck Walbourn?) called Expanded 709 (Expand Gamut set to On in RetroArch, or HDR: Original/Vivid set to Vivid in Megatron).

Obviously, this is undesirable, as all of the major “retro” color gamuts include colors that fall outside of Rec. 709.

Serendipitously, i found that it was possible to turn this problem into it’s own solution by simply adding additional color gamuts to the “HDR: Original/Vivid”, renaming it “HDR: Content Color Gamut” to better reflect it’s newfound purpose.

When using this setting, Colour System should be set to 0/r709, and Phosphors should be set to 0/NONE.

Options are as follows:

• 0=Rec 709/sRGB (SDR HDTV/Windows gamut)
• 1=Expanded 709
• 2=NTSC 1953 (The OG color system that was only really used for like 5-8ish years back when basically no one owned a color TV anyway. If you are Brazillian or from a SECAM region, it may also match some old CRT TVs you’ve used with really weirdly intense greens? Hard to say. This sort of thing is kind of underdocumented.)
• 3=RCA 1958 (?1961?) (Millennial’s grandparent’s old TV with weird colors #1.)
• 4=RCA 1964 (Millennial’s grandparent’s old TV with weird colors #2.)
• 5=SMPTE C/Rec 601-525 line/Conrac (Baseline standard gamut for Analog NTSC.)
• 6=PAL/Rec 601-625 line (Baseline standard gamut for Analog PAL.)
• 7=Dogway’s NTSC-J (Baseline standard gamut for Analog NTSC-J.)
• 8=P22_80s (Dogway’s Grade gamut for 1980s-early 1990s TVs.)
• 9=Apple RGB/Trinitron PC (Should approximate basically any Trinitron monitor from 1987-the mid to late 1990s. By the early 00s, they were SMPTE C instead, at least for high end monitors like the FW900.)
• 10=guest’s Philips PC (Gamut used by a number of extremely popular monitors that used Philips tubes, including Philips CM8533, Philips VS-0080, and Commodore 1084)
• 11=P22_90s (Dogway’s Grade gamut for mid 1990s TVs with tinted phosphors.)
• 12=RPTV_95s (Dogway’s Grade gamut for late 90s/early 00s rear projection TVs that game manuals said you shouldn’t play games on due to burn in risk.)
• 13=Display P3/P3-D65 (Common wide color gamut. Variant on the gamut used for film with shared primaries. Might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader?)
• 14=Rec 2020 (HDR gamut. Again, might be useful in the future if someone makes a WCG pixel game that looks best with a CRT shader.)

Gamut Overshoot Fix

A fix MajorPainTheCactus came up with to deal with the color errors i noticed using lilium’s HDR analysis shader. (Sony Megatron Colour Video Monitor)

He decided not to implement it at the time, as he didn’t think it wouldn’t make a perceptible difference, but a friend and i both came to the conclusion that it makes certain test pattern colors look more like they do with no shaders applied, so i have continued to use it. There should be no downside. (Sony Megatron Colour Video Monitor)

• 0=no fix
• 1=the 7-decimal clamp
• 2=the 6-decimal clamp (results in non-zero blacks, perceptible in a sufficiently dark room)

Scanline Multiplier/Divisor

Multiplies or divides the number of scanlines.

Useful for cases like DOS games meant for 31KHz displays, which output 320x200 that was then double scanned to 640x400.

The divisor options are handy for displaying increased internal resolution output from 3D cores that don’t include a good downsample option, such as PPSSPP. I strongly recommend using this setting in conjuction with crt-guest-advanced-ntsc’s Internal Resolution setting to reduce shimmering.

• -1,0,1=1x (Default/off)
• 2=2x (Doublescan)
• 3=Auto 2x (Automatically doublescans any content with a vertical resolution of less than 300, while leaving higher resolution content unchanged)
• -2=1/2 (Reduces the scanline count to one half default)
• -3=1/3 (Reduces the scanline count to one third default)
• -4=1/4 (Reduces the scanline count to one quarter default)
• -5=1/5 (etc.)
• -6=1/6
• -7=1/7
• -8=1/8
• -9=1/9
• -10=1/10
• -11=1/11
• -12=1/12
• -13=1/13
• -14=1/14
• -15=1/15
• -16=1/16

[Azurfel]

New CRT shader from Guest + CRT Guest Advanced updates

AzMods20251028, updated for crt-guest-advanced-2025-10-28-release1.

Readme with additional details

Built on top of: Image Adjustment (2024.02.07) by hunterk crt-guest-advanced-2025-10-28-release1 by guest.r and Dr. Venom, based in part on Themaister’s NTSC shader Sony Megatron Colour Video Monitor (2023.10.09) by MajorPainTheCactus with additional functions based on or inspired by Grade by Dogway All included “CRT Megatron” presets are currently tuned for the LG C1 and other simil…

[Azurfel]

New CRT shader from Guest + CRT Guest Advanced updates

AzMods20251108 Updated for crt-guest-advanced-2025-11-02-release1 (rev 2) Added a new setting to crt-guest-advanced-ntsc-decoupled called “0 IRE Device on 7.5 IRE Display”. This setting automatically modifies the “Raise Black Level” setting to simulate what would have happened if a device with 0 IRE black (NTSC-J standard) were connected to a display calibrated for 7.5 IRE black (NTSC standard). This applies to both the Japanese and US versions of literally every single CRT targeted Jap…

[Cyber]

Hey man, thanks a lot for your continued support and dedication to our beloved shader tools!

I’ve tested it and was able to eventually tweak things to my liking after some experimentation. Although I’m strongly intertwined and invested in the shader stack I currently use, I’m not ruling out a switch over to your cleaner and more accurate stack at some point in the future.

Nonetheless, you’ve taken the, (abandoned?), no offense to @MajorPainTheCactus Sony Megatron Colour Video Monitor shader and kept it in line with current trends and developments which is quite commendable and appreciated and something that others might eventually live and grow to appreciate.

I think this shader “suffers” from being a bit “ahead of its time” for the average user and it also has a bit of a marketing / PR issue since its difficult to showcase on current setups to mainstream audiences.

Those who know, know though but that is a niche of a niche.

So I would like to nominate AzMods20251108 for a RetroArch PR to reside alongside the existing Sony Megatron Colour Video Monitor shader which can remain as a simpler, leaner foundational vanilla version.

I propose that you take a look at the stack I currently use in my miniLED Epic preset pack and include and incorporate some of the additional feature which may lie therein, for example additional RGB Masks which replaced some of the “8K” Masks and Optional presets which incorporate XBR-LEVEL-2.

The IMG_MOD_CYBERLAB Grain feature can be excised in favour of the new RF Noise feature from decoupled CRT-Guest-Advanced-NTSC.

That’s about it basically.

Again, thanks a lot to you, @guest.r, @Dogway, @HunterK, @MajorPaintheCactus and all others who helped make this shader what it is today.

[Azurfel]

I’ve been thinking it might be time for a separate “AzMods” topic myself, since this thread has gotten pretty quiet lately. I’ll probably consider if i want to stick with the AzMods name or go with something else, and then post that some time in the next couple weeks, with a few new additions i have been considering.

@Cyber

I propose that you take a look at the stack I currently use in my miniLED Epic preset pack and include and incorporate some of the additional feature which may lie therein, for example additional RGB Masks which replaced some of the “8K” Masks and Optional presets which incorporate XBR-LEVEL-2.

I will take a look and see what i might be able to include!

[Cyber]

@hunterk

That is, are those white pixels lighting up the 3 (or 4?) subs? or just the one white sub?

In hindsight, I’m almost certain that those were the white subpixels alone.

[colourofsound]

@MajorPainTheCactus @Azurfel

I’ve been loving the original presets for Megatron, especially now I’ve got Retroarch working in HDR on my LG BX.

I’ve been working on getting them going in Reshade on my Bazzite mini-PC build; and I’m having mixed results.

I’m interested to know what settings @MajorPainTheCactus uses in his show case video on Youtube with Dead Cells; and I’m also interested in a discussion about the best way to setup the CRT_HEIGHT resolution in order to get a decent CRT emulation whilst still making text in modern games more readable.

I got into this hole with Octopath Traveller, and I am finding with that it needs a close-to-native CRT_Height resolution and a high TVL to make the high resolution text in the game readable. I’ve gone with the JVC shadowmask preset on that game with the resolution settings matching the game; and whilst the effect is subtle it is worth it.

Another game on Steam which really benefits from a shader is Jack Move; and it looks great.

I was using the Guest Reshade port previously but its GPU overhead is considerable in comparison to Megatron, and on miniPCs you need all the power you can get!

Thanks again for all your work on this guys. /essay